Erst vs. Formerly — What's the Difference?

Difference Between Erst and Formerly
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Definitions
Erst➦
Erstwhile.
Formerly➦
At an earlier time; once.
Erst➦
(obsolete) First.
Formerly➦
At some time in the past
Xenia Robertson, formerly known as Xenia Isaamov, is from Ukraine.
Erst➦
(obsolete) First of all, before (some other specified thing).
Formerly➦
Previously; once
This ranch was formerly owned by slaveholders.
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Erst➦
(obsolete) Sooner (than); before.
Formerly➦
In time past, either in time immediately preceding or at any indefinite distance; of old; heretofore.
Erst➦
Formerly, once, erstwhile.
Formerly➦
At a previous time;
Once he loved her
Her erstwhile writing
Erst➦
First.
Erst➦
Previously; before; formerly; heretofore.
Tityrus, with whose style he had erst disclaimed all ambition to match his pastoral pipe.
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Erst➦
At a previous time;
Once he loved her
Her erstwhile writing